Revision 2 for 'Polka-dot sign'
Polka dot sign
Polka dots refer to a clothing pattern consisting of equally sized and spaced filled circles. It is generally confined to more playful attire e.g. bathing suits and lingerie1. In medical imaging, this pattern can be found on transverse CT (white on black) or MR (black on white) sections of the spine. It is caused by replacement of the normal cancellous bone by thickened vertical trabeculae surrounded by fat marrow or vascular lacunae in intraosseous haemangiomas2.